Wagga's Dylan Martin got his Olympic campaign off to a winning start on Saturday.
Martin was one of 11 Kookaburras to make their debut in the 5-3 win over host nation Japan.
However the world number side had to overcome a scare from the 15th ranked team, who scored three straight goals in the second quarter to take 3-2 lead.
Australia got out to a comfortable 2-0 lead in the first quarter before Japan fired back in Tokyo with three goals in the space of six minutes.
A double to Kenta Tanaka had the Kookaburras on the back foot but they responded to level things four minutes after half-time.
Goals to Aran Zalewski and Daniel Beale sealed the win.
Coach Colin Batch wants the side to be smarter with the ball and play to their own game style, not their opponents.
"We played into their tactics a little bit, assisted their counterattack," Batch said.
"While we set out not to do that before the game, we were not good in the second quarter and learned a lot from it.
"We had good composure in the first quarter and a very good second half.
"Japan is a good side; very fast, good counterattack, we didn't take them lightly, but we needed to be smarter with what we did with the ball."
Australia's second game is against fifth-ranked India on Sunday night.